Vacuum tube



y 1932. A. NYMA N 1,861,401

VACUUM TUBE Original Filed Nov.2l, 1924 2 sheets-sheet 1 ATTORNEY May 31, 1932. A. NYMA 1,861,401

VACUUM T UBE',

Original Filed Nov. 21, 1924 2 Sheets-Sheet 2 lNVEN TOR flux/1 NOE/P Ny/m/v ATTORNEX Patented May 31, 1932 PATENT rFcE ALEXANDER NYMAN, OF DOIBBS FERRY, NEW YORK, ASSIGNOR TO DUBILIER CON- DENSER CORPORATION, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE VACUUM TUBE Application filed November 21, 1924, Serial No. 751,251. Renewed October 22, 1931.

My invention relates to vacuum tubes of the audion or thermionic valve type, and particularly vacuum tubes adapted for radio apparatus employing the principle of resistance-repeating amplification.

An object of this invention is to provide an amplifier vacuum tube that facilitates the assembly of radio apparatus, reduces the cost, and permits the finished apparatus to be of smaller dimensions.

For this purpose I have constructed a vac uum tube within which, along with the conventional cathode and other electrodes suit ably shaped, rigidly located, and spaced with reference to each other, both the leak and coupling resistances are contained.

The nature of the invention is set forth in the following description, and the novel features pointed out in the appended claims; but I, of course, reserve the right to make changes consistent with the spirit of this invention, and within the scope thereof.

Referring to the figures of the accompanying drawings Fig. 1 is a diagram presenting a vacuum tube according to my invention;

Fig. 2 is a longitudinal section of such a tube, showing all the interior parts;

Fig. 3 is a horizontal section along the line 33 of Fig. 2;

Fig. 4 is a horizontal section along the line H, Fig. 2;

Fig. 5 shows the circuit connections of a resistance-repeating amplifying arrangement containing the herein described amplifier tubes with their included parts.

The same numerals identify the same parts.

For convenience I shall describe my invention in connection with a radio receiving set, although it is not limited to such apparatus. The time and patience required to make the proper connections of the numerous resistances in a receiving set of the type shown in Fig. 5 is often very expensive in quantity production of such wireless apparatus; and often also. owing to the multiplicity of connections, the operation of assembling is quite liable to result in the occurrence of delays and mistakes.

I avoid all these disadvantages by mounting the leak and repeating resistances inside the tub-es, as set forth diagrammatically in Figs. 1 and 5. Fig. 1 shows an evacuated vessel or tube 1, containing the usual filament 5, plate or anode 6, and grid 7, also a leak resistance 8 and a coupling or plate resistance 9. The mechanical construction of such a tube is shown in Fig. 2, whereon 1 represents the exhausted container, preferably of glass, with sealed-in insulating stem 2 mounted in a tubular socket or ferrule 3, the bottom of which is closed by a disk or body 4 of suitable material, such as porcelain. In the bulb or container are supported the filament 5, plate 6 and grid 7. Upon the upper end of the stem 2 surrounding the leading-in wires to the filament and grid, and in electrical contact therewith, is located the grid resistor or leak resistance 8. This resistor is of therorder of megohms and is of suitable material molded to the required shape, and freed of occluded gas. If preferred, this grid leak may be prepared in the form of a suitable paste of low conductivity and applied directly upon the upper surface of the insulating stem 2. Adjacent one side of the plate or anode 6 is a coupling or repeating resistance 9, also within the tube 1. This resistor 9, whose value may be from 20,000 to 100,000 ohms, may be of any suitable resistance material capable of being freed of contained gas and moisture, and not subject to changes from heat.

The filament 5 is mounted by being attached at its two lower ends to pieces of wire or the like 10 which pass through the resistor 8 and are in contact therewith. and are further embedded in the stem 2. To each of the supports 10 is secured a conductor 11 by which the filament can be connected to the outside circuit. Connected with the plate 6, which may be hollow so that the grid and filament may be disposed inside of it, is a conductor 12 passing through the insulation 4 and stem 2, and spaced from the resistor 8 by a suitable distance. To assist in holding the plate or anode 6, I may also use a support 13 similar to the supports 10, which is attached to the lower end of the plate at one side and is embedded at its opposite extremity in the stem 2. This support is also spaced a suitable distance from the leak resistance 8. As for the grid, I provide a lead-in wire 14 extending through the porcelain 4, stem 2 and resistance 8, to connect with one end of the grid, and the grid may also be provided with a support 15 placed like the support 13 for the plate to be connected with the grid at one end and embedded in the stem 2 the other. ilhis support 15 may make contact with the resistance 8, as this resistance should be connected across or between the filament 5 and grid 7; but should not be in contact with the plat 6 or the lead or support for the same. The body of the grid is indicated by the numeral. 16 and may consist of a number of spiral turns of wire held between the upright conductor 16 and support 15 within the plate and surrounding the filament 2. Of course, the particular arrangement of the filament or cathode 5, the plate or anode 6 and the grid may be varied within wide limits, and I show them arranged so that the wire 14:, the support 15 and the filament 5, are inside of the plate 6, only for the sake of illustration. The coupling resistance 9 may be made up in any suitable form and it is united at one extremity by the conductor 17, which also acts as a support, to the plate 6, the other extremity being connected to a conductor 18 which is sealed into the stem 2 and soldereo in contact with the metallic socket 3.

The conductors 11, 12 and 14 passing through the bottom 4 may be connected with contact studs not shown, but attached to this bottom in the usual way, so that the base or ferrule 3, of the tube, can be inserted in an ordinary socket to permit the tube to be readily mounted in position with reference to the Wireless apparatus in which it is to be operated.

Fig. 5 shows the manner in which tubes constructed in accordance with my invention may be used in a receiving set to reduce the number of external circuit connections and to simplify the set. Such tubes enclosing not merely the usual filament, plate and grid, but also the resistances which have heretofore been mounted and connected in locations external to the tubes, enable one to construct and assemble a wireless set of relatively small size and in much less time and with less risk of making incorrect connections, and thus the production ct such wireless amplifying sets is greatly facilitated and cheapened.

Although in the accompanying drawings I show but a particular manner of locating and retaining the above described resistors in place within an amplifier bulb, it is to be understood that I do not limit my invention merely to this form of construction, for it is self-evident that other convenient locations of the resistors within the bulb may be employed with equal efi ectiveness.

Having described my invention, what I believe to be new and desire to secure and otect by Letters Patent of the United tee is 1. A vacuum tube comprising an exhausted vessel containing a plate, a grid, a filament, a leak resistance, and a coupling resistance within said tube.

2. A vacuum tube comprising an exhausted vessel containing a plate, a grid, a filament, a leak resistance, and a coupling resistance within saic tube, said leak resistance being connected to the grid and filament, and the coupling resistance to the plate in the tube.

3. A vacuum tube comprising an exhausted vessel containing a grid, a filament and a plate, said vessel having a sealed-in stem by which the plate, grid and filament are supported, a base of conductive material enveloping one end of the tube, a resistance in the tube attached at one end to the pie e, and a conductor united to the other end of said resistance and passing through said stem and making contact with base.

4:. A vacuum tube comprising an exhausted vessel, enclosing a plate, a grid and a filament, said tube having a sealed-in stem at one end, and a base of conducting material enveloping said end, conductors leading to the plate, grid and filament passing through said stem, a body of material of low conductivity disposed on said stem and connecting the conductors leading to the grid and filament, a resistance connected at one end to the plate and a conductor united to the opposite end of the last-named resistance and passing through said stem into contact with said base.

5. A vacuum tube comprising an exhausted vessel containing an anode and a coupling resistance also in the tube connected to said anode, and a separate terminal for the anode and resistance respectively.

6. A vacuum tube comprising an exhausted envelope enclosing filament, grid and plate electrodes, a coupling resistance and a grid leak resistance within the tube, the coupling resistance being electrically connected within the tube to the plate, the grid leak resistance being electricallyconnected within the tube to the filament and grid, the coupling resistance having an individual terminal for connection to an external circuit.

In testimony whereof I m signature.

ALEXANDER i IYMAN. 

